The American Academy of Pediatrics website is a more physician focused site but contains a lot of enlightening information for the doctor inside all of us!
HealthyChildren.Org
This website is an extremely informative source for information ranging from the general to the specific encompassing an endless array of topics pertaining to your child and their health needs. It was developed and is maintained by the American Academy of Pediatrics.
La Leche League International
La Leche League International was founded in 1956 and serves as a comprehensive source for information, support and resources for breastfeeding mothers and their families.
Centers for Disease and Control Prevention
The Centers for Disease and Control Prevention is tasked with protecting public health and safety through the control and prevention of disease, injury, and disability. The website serves as an intelligent source of information on a vast variety of topics including infectious diseases, vaccines and obesity.